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from __future__ import unicode_literals
from django.db import models
from django.db.models import signals
from django.dispatch import receiver
from django.test import TestCase
from django.utils import six
from .models import Author, Book, Car, Person
class BaseSignalTest(TestCase):
def setUp(self):
# Save up the number of connected signals so that we can check at the
# end that all the signals we register get properly unregistered (#9989)
self.pre_signals = (
len(signals.pre_save.receivers),
len(signals.post_save.receivers),
len(signals.pre_delete.receivers),
len(signals.post_delete.receivers),
)
def tearDown(self):
# Check that all our signals got disconnected properly.
post_signals = (
len(signals.pre_save.receivers),
len(signals.post_save.receivers),
len(signals.pre_delete.receivers),
len(signals.post_delete.receivers),
)
self.assertEqual(self.pre_signals, post_signals)
class SignalTests(BaseSignalTest):
def test_model_pre_init_and_post_init(self):
data = []
def pre_init_callback(sender, args, **kwargs):
data.append(kwargs['kwargs'])
signals.pre_init.connect(pre_init_callback)
def post_init_callback(sender, instance, **kwargs):
data.append(instance)
signals.post_init.connect(post_init_callback)
p1 = Person(first_name="John", last_name="Doe")
self.assertEqual(data, [{}, p1])
def test_save_signals(self):
data = []
def pre_save_handler(signal, sender, instance, **kwargs):
data.append(
(instance, kwargs.get("raw", False))
)
def post_save_handler(signal, sender, instance, **kwargs):
data.append(
(instance, kwargs.get("created"), kwargs.get("raw", False))
)
signals.pre_save.connect(pre_save_handler, weak=False)
signals.post_save.connect(post_save_handler, weak=False)
try:
p1 = Person.objects.create(first_name="John", last_name="Smith")
self.assertEqual(data, [
(p1, False),
(p1, True, False),
])
data[:] = []
p1.first_name = "Tom"
p1.save()
self.assertEqual(data, [
(p1, False),
(p1, False, False),
])
data[:] = []
# Calling an internal method purely so that we can trigger a "raw" save.
p1.save_base(raw=True)
self.assertEqual(data, [
(p1, True),
(p1, False, True),
])
data[:] = []
p2 = Person(first_name="James", last_name="Jones")
p2.id = 99999
p2.save()
self.assertEqual(data, [
(p2, False),
(p2, True, False),
])
data[:] = []
p2.id = 99998
p2.save()
self.assertEqual(data, [
(p2, False),
(p2, True, False),
])
finally:
signals.pre_save.disconnect(pre_save_handler)
signals.post_save.disconnect(post_save_handler)
def test_delete_signals(self):
data = []
def pre_delete_handler(signal, sender, instance, **kwargs):
data.append(
(instance, instance.id is None)
)
# #8285: signals can be any callable
class PostDeleteHandler(object):
def __init__(self, data):
self.data = data
def __call__(self, signal, sender, instance, **kwargs):
self.data.append(
(instance, instance.id is None)
)
post_delete_handler = PostDeleteHandler(data)
signals.pre_delete.connect(pre_delete_handler, weak=False)
signals.post_delete.connect(post_delete_handler, weak=False)
try:
p1 = Person.objects.create(first_name="John", last_name="Smith")
p1.delete()
self.assertEqual(data, [
(p1, False),
(p1, False),
])
data[:] = []
p2 = Person(first_name="James", last_name="Jones")
p2.id = 99999
p2.save()
p2.id = 99998
p2.save()
p2.delete()
self.assertEqual(data, [
(p2, False),
(p2, False)
])
data[:] = []
self.assertQuerysetEqual(
Person.objects.all(), [
"James Jones",
],
six.text_type
)
finally:
signals.pre_delete.disconnect(pre_delete_handler)
signals.post_delete.disconnect(post_delete_handler)
def test_decorators(self):
data = []
@receiver(signals.pre_save, weak=False)
def decorated_handler(signal, sender, instance, **kwargs):
data.append(instance)
@receiver(signals.pre_save, sender=Car, weak=False)
def decorated_handler_with_sender_arg(signal, sender, instance, **kwargs):
data.append(instance)
try:
c1 = Car.objects.create(make="Volkswagen", model="Passat")
self.assertEqual(data, [c1, c1])
finally:
signals.pre_save.disconnect(decorated_handler)
signals.pre_save.disconnect(decorated_handler_with_sender_arg, sender=Car)
def test_save_and_delete_signals_with_m2m(self):
data = []
def pre_save_handler(signal, sender, instance, **kwargs):
data.append('pre_save signal, %s' % instance)
if kwargs.get('raw'):
data.append('Is raw')
def post_save_handler(signal, sender, instance, **kwargs):
data.append('post_save signal, %s' % instance)
if 'created' in kwargs:
if kwargs['created']:
data.append('Is created')
else:
data.append('Is updated')
if kwargs.get('raw'):
data.append('Is raw')
def pre_delete_handler(signal, sender, instance, **kwargs):
data.append('pre_delete signal, %s' % instance)
data.append('instance.id is not None: %s' % (instance.id is not None))
def post_delete_handler(signal, sender, instance, **kwargs):
data.append('post_delete signal, %s' % instance)
data.append('instance.id is not None: %s' % (instance.id is not None))
signals.pre_save.connect(pre_save_handler, weak=False)
signals.post_save.connect(post_save_handler, weak=False)
signals.pre_delete.connect(pre_delete_handler, weak=False)
signals.post_delete.connect(post_delete_handler, weak=False)
try:
a1 = Author.objects.create(name='Neal Stephenson')
self.assertEqual(data, [
"pre_save signal, Neal Stephenson",
"post_save signal, Neal Stephenson",
"Is created"
])
data[:] = []
b1 = Book.objects.create(name='Snow Crash')
self.assertEqual(data, [
"pre_save signal, Snow Crash",
"post_save signal, Snow Crash",
"Is created"
])
data[:] = []
# Assigning and removing to/from m2m shouldn't generate an m2m signal.
b1.authors = [a1]
self.assertEqual(data, [])
b1.authors = []
self.assertEqual(data, [])
finally:
signals.pre_save.disconnect(pre_save_handler)
signals.post_save.disconnect(post_save_handler)
signals.pre_delete.disconnect(pre_delete_handler)
signals.post_delete.disconnect(post_delete_handler)
def test_disconnect_in_dispatch(self):
"""
Test that signals that disconnect when being called don't mess future
dispatching.
"""
class Handler(object):
def __init__(self, param):
self.param = param
self._run = False
def __call__(self, signal, sender, **kwargs):
self._run = True
signal.disconnect(receiver=self, sender=sender)
a, b = Handler(1), Handler(2)
signals.post_save.connect(a, sender=Person, weak=False)
signals.post_save.connect(b, sender=Person, weak=False)
Person.objects.create(first_name='John', last_name='Smith')
self.assertTrue(a._run)
self.assertTrue(b._run)
self.assertEqual(signals.post_save.receivers, [])
class LazyModelRefTest(BaseSignalTest):
def setUp(self):
super(LazyModelRefTest, self).setUp()
self.received = []
def receiver(self, **kwargs):
self.received.append(kwargs)
def test_invalid_sender_model_name(self):
with self.assertRaisesMessage(ValueError,
"Specified sender must either be a model or a "
"model name of the 'app_label.ModelName' form."):
signals.post_init.connect(self.receiver, sender='invalid')
def test_already_loaded_model(self):
signals.post_init.connect(
self.receiver, sender='signals.Book', weak=False
)
try:
instance = Book()
self.assertEqual(self.received, [{
'signal': signals.post_init,
'sender': Book,
'instance': instance
}])
finally:
signals.post_init.disconnect(self.receiver, sender=Book)
def test_not_loaded_model(self):
signals.post_init.connect(
self.receiver, sender='signals.Created', weak=False
)
try:
class Created(models.Model):
pass
instance = Created()
self.assertEqual(self.received, [{
'signal': signals.post_init, 'sender': Created, 'instance': instance
}])
finally:
signals.post_init.disconnect(self.receiver, sender=Created)
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